120 lines
3.9 KiB
JavaScript
120 lines
3.9 KiB
JavaScript
'use strict';
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var $TypeError = require('es-errors/type');
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var callBound = require('call-bind/callBound');
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var regexTester = require('safe-regex-test');
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var every = require('../helpers/every');
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var $charAt = callBound('String.prototype.charAt');
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var $strSlice = callBound('String.prototype.slice');
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var $indexOf = callBound('String.prototype.indexOf');
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var $parseInt = parseInt;
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var isDigit = regexTester(/^[0-9]$/);
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var inspect = require('object-inspect');
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var Get = require('./Get');
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var IsArray = require('./IsArray');
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var ToObject = require('./ToObject');
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var ToString = require('./ToString');
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var isInteger = require('../helpers/isInteger');
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var isStringOrUndefined = require('../helpers/isStringOrUndefined');
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// http://www.ecma-international.org/ecma-262/12.0/#sec-getsubstitution
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// eslint-disable-next-line max-statements, max-params, max-lines-per-function
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module.exports = function GetSubstitution(matched, str, position, captures, namedCaptures, replacement) {
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if (typeof matched !== 'string') {
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throw new $TypeError('Assertion failed: `matched` must be a String');
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}
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var matchLength = matched.length;
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if (typeof str !== 'string') {
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throw new $TypeError('Assertion failed: `str` must be a String');
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}
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var stringLength = str.length;
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if (!isInteger(position) || position < 0 || position > stringLength) {
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throw new $TypeError('Assertion failed: `position` must be a nonnegative integer, and less than or equal to the length of `string`, got ' + inspect(position));
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}
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if (!IsArray(captures) || !every(captures, isStringOrUndefined)) {
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throw new $TypeError('Assertion failed: `captures` must be a possibly-empty List of Strings or `undefined`, got ' + inspect(captures));
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}
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if (typeof replacement !== 'string') {
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throw new $TypeError('Assertion failed: `replacement` must be a String');
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}
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var tailPos = position + matchLength;
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var m = captures.length;
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if (typeof namedCaptures !== 'undefined') {
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namedCaptures = ToObject(namedCaptures); // eslint-disable-line no-param-reassign
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}
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var result = '';
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for (var i = 0; i < replacement.length; i += 1) {
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// if this is a $, and it's not the end of the replacement
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var current = $charAt(replacement, i);
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var isLast = (i + 1) >= replacement.length;
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var nextIsLast = (i + 2) >= replacement.length;
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if (current === '$' && !isLast) {
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var next = $charAt(replacement, i + 1);
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if (next === '$') {
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result += '$';
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i += 1;
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} else if (next === '&') {
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result += matched;
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i += 1;
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} else if (next === '`') {
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result += position === 0 ? '' : $strSlice(str, 0, position - 1);
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i += 1;
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} else if (next === "'") {
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result += tailPos >= stringLength ? '' : $strSlice(str, tailPos);
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i += 1;
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} else {
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var nextNext = nextIsLast ? null : $charAt(replacement, i + 2);
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if (isDigit(next) && next !== '0' && (nextIsLast || !isDigit(nextNext))) {
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// $1 through $9, and not followed by a digit
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var n = $parseInt(next, 10);
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// if (n > m, impl-defined)
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result += n <= m && typeof captures[n - 1] === 'undefined' ? '' : captures[n - 1];
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i += 1;
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} else if (isDigit(next) && (nextIsLast || isDigit(nextNext))) {
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// $00 through $99
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var nn = next + nextNext;
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var nnI = $parseInt(nn, 10) - 1;
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// if nn === '00' or nn > m, impl-defined
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result += nn <= m && typeof captures[nnI] === 'undefined' ? '' : captures[nnI];
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i += 2;
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} else if (next === '<') {
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if (typeof namedCaptures === 'undefined') {
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result += '$<';
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i += 2;
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} else {
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var endIndex = $indexOf(replacement, '>', i);
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if (endIndex > -1) {
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var groupName = $strSlice(replacement, i + '$<'.length, endIndex);
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var capture = Get(namedCaptures, groupName);
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if (typeof capture !== 'undefined') {
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result += ToString(capture);
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}
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i += ('<' + groupName + '>').length;
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}
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}
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} else {
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result += '$';
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}
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}
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} else {
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// the final $, or else not a $
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result += $charAt(replacement, i);
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}
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}
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return result;
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};
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